JPS5937368A - Mechanical seal - Google Patents

Abstract

PURPOSE:To provide a mechanical seal with good wear resistance, in which corrosion by the joint liquid is well prevented, by dispersion-jointing a ferric base metal with ceramics of silicon type firmly using a main insert member containing aluminum as main component and by jointing the inner and outer surfaces of this main insert member while an anti-corrosive insert member with Ti, Ag or An as its main component is pinched. CONSTITUTION:By a ring 1 of a mechanical seal, a sliding member 1b made of ceramics of silicon type is dispersion-jointed to a ferric base metal 1a. This dispersion jointing is performed not directly but by interposing an insert member between the two. As a main insert member 1c is used a ring-shaped object cut from pure Al sheet. For the inside of this insert member 1c is used an anti- corrosive insert member 1d in the form of narrow ring with Ti, Ag or Au as its main component. This insert member 1d may also be provided at the outside surface of the insert member 1c. Temperature at the time of dispersion jointing shall be exceeding the eutectic temperature of Fe, Al, Si and insert member 1d and, at the same time, below the melting point of Al. Thus Al is prevented from direct contact with corrosive fluids.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a mechanical seal, particularly one in which the sliding part of the IJ 7 is made of silicone ceramics, which can be provided at low cost and has good corrosion resistance.

It would be a good idea for anyone to use silicon ceramics as the material for the sliding part of the ring of a mechanical seal, especially in terms of wear resistance. ) For this reason, it is impossible to make the entire ring of silicone ceramics because of its poor processability, cost, and cost. Therefore, various attempts have been made to form mechanical seal rings by watertightly bonding ceramics to iron-based alloys. However, there were none that could be put to practical use, such as requiring early opening for joining or being able to achieve sufficient joining strength.

Therefore, the inventor came up with the idea of diffusion bonding iron-based metals and silicon-based ceramics, and conducted various experiments. As a result, it was discovered that sufficient bonding could be achieved by using aluminum metal as the insert material, and the details of this have already been filed in Japanese Patent Application No. 15418/1983.

However, even if the ring of a mechanical seal is constructed by such diffusion bonding, since mechanical seals are usually used not only for water pumps but also for sealing in corrosive environments, there is a possibility that the ring may come into contact with corrosive fluids. ,
There is a risk that the insert material whose main component is aluminum may be corroded.Therefore, the object of the present invention is to provide a mechanical seal that utilizes the above-mentioned diffusion bonding and also has good corrosion resistance. shall be.

Embodiments of this invention will be described in detail below with reference to the drawings. It is to be understood that the drawings represent each separate embodiment above and below the centerline.

1. In each figure, 1 is the seat ring of this mechanical seal. It is fixed to the pump casing 2 via a buffer ring 3. 4 is a driven ring.

The ring 1 is formed by diffusion bonding a silicon ceramic sliding material 1b to an iron base metal 1a.

This diffusion bonding is not directly bonded, but requires that the insert material be held between them. As a result of various experiments, this insert material may be used by stacking two types of insert materials (Japanese Patent Application No. 57-3770), but as mentioned above, it is easier and cheaper to use aluminum (Az) alone. The main inserter i・
For the materials 1c and I, 41 old, which has A4 as its main component, is used.

Base metal 1akJ: In these examples, stainless steel (
SUS B 04 T, ) shall be used, and as the silicon-based ceramic for the sliding month 1b, silicon carbide (SiC), which has particularly excellent wear resistance and is highly practical, shall be used.
) shall be used.

In the embodiment shown in FIG. 1, the main insert members 1e and 1.
Pure A/, Sea 1 (A4>99.8%, thickness 1mm
) using linori stitched on Jζ. Furthermore, in this embodiment, a corrosion-resistant insert material in the shape of +J-al'lyl with a width is added inside the lc as an insert material.
use. As the insert toy J' ] d, a sheet shank made of titanium (Ti), silver (Ag), or gold (Au) and having a thickness of 1 + om is used.

Then, the base metal 1a and the sliding material tb were ultrasonically cleaned in acetone for 10 minutes, and the insert ')+'A
' After pretreatment by washing 1c and 1d in acetone, they were stacked on top of each other as shown and heated to about 1o-5 Tor.
Diffusion bonding was carried out for 60 minutes in a vacuum at a temperature of 6,500 C1 and a pressure of 2 to 41 g/-, respectively. As a result, good bonding was obtained. The shear strength was 6-8 kg/, H, and failure occurred at the SiC-AL interface or the A7-8US 304 interface.

Next, as another example, pure At foil (JIS standard A I
Using N 30 H-T-(18) and using foil as the insert material 1d, these were pretreated in the same manner as described above.

Diffusion bonding was performed in a vacuum of about 10 Torr at a bonding temperature of 650° C. and a bonding pressure of about 2 to 4 kg/trU for 60 minutes.

The results are good, the shear strength is 4-6 ky/
ma, and destruction occurred at the 5iC-AL interface.

Other Inser) At of about l■t as 1 c
-Cu-based alloy sheet) (JIS standard A2024PC-T3
) or about 1 mm t of At-Mg alloy sheet]
・(JIS standard A3052P-H112), approximately 1 mm
t of At -Mg2 Si-based alloy sheet (JIS standard A6061P-0) or about 1 ttrm t of At
-Zn alloy sheet (JIS standard A7075PC-0)
Similar results were obtained using 66. In these examples, the insert material 1d is a sheet, foil, or linear body whose main component is Ti, Agt, or Au and has approximately the same thickness as the insert material 1c. These 4' and A materials may be alloys containing these materials as main components.

The temperature during the above-mentioned diffusion bonding is selected to be above the eutectic temperature between Fe, At, Sl, and the inserter 1-4'A' d, and below the melting point of At, and other conditions are the same as those of known diffusion bonding. Depends on technology.

In these examples described above, '' as the insert material 1d
J'i, Ag and Au are At, SiC and SUS
Both are diffusion bonded to prevent corrosive fluids from coming into direct contact with A7, protecting it from corrosion.

In the example shown in Fig. 2, the insert material 1d is replaced with the old insert 1c.
It is also applied to the outer periphery of each insert 4'A.
There is no difference in the materials of 'lc and ld or the method of diffusion bonding.

In the embodiment shown in FIG. 8, an insert material 1d of T1 is sandwiched between an insert material 1c and a base metal la, and an edge is provided on the inner periphery of the insert material 7. By doing this, the insert material 1d is diffusion-bonded with the SUS of the base metal 1a and also with the At of the insert material 1c, making the clamping more reliable, especially when Ti is used as the material of the insert material 1d. sell.

In the embodiment shown in FIG. 4, a groove into which a wire insert material 1d is inserted is bored in the base metal 1a.
This ensures that d is held securely.

In addition to the above-mentioned embodiments, this invention is also applicable, for example, to the base metal 1a made of SUS.
Iron-based metals other than SiC may also be used, and silicon-based ceramics include SiC as well as silicon nitride (Si3
Ni) may also be used. Other replacements with equivalents of each configuration within the scope of the technical idea of this invention are also possible! ,
This invention falls within the technical scope of this invention.

As described above, this invention strongly diffusion-bonds an iron base metal and a silicon-based ceramic with a main insert material mainly composed of aluminum, and furthermore, the inner and/or outer periphery of the main insert material is bonded with Ti, Agt, etc. Since the m1 eclipse insert material containing Au as the main component is sandwiched and bonded at the same time, it is possible to provide a mechanical seal equipped with a ring that not only has good wear resistance but also can prevent corrosion due to contact with liquid. It is.

[Brief explanation of drawings]

Each of the drawings shows each embodiment of the present invention, and each is a longitudinal side view. ]・Sea 1・Ring. 1a... Iron base metal, lb...
Sliding material, lc...Main insert material, ld...Corrosion-resistant insert material. Applicant ShinMaywa Industries Co., Ltd. Agent Tadashi Inoue (and one other person) Procedural amendment (Mr.) l. Incident display Showa S7 Noka-Kengandai/'D'? 70 No. 2,
Address of the person making the correction: 1-5-25 Kozone-cho, Nishinomiya City, Hyogo Prefecture
(235) ShinMaywa Industries Co., Ltd. 4, Agent Address: 6-107 Takkino-cho, Nishinomiya City, Hyogo Prefecture ShinMaywa Industries Co., Ltd. Development Center 'I'EL (0798) 51-7734 (actor) 7,
Area subject to amendment 2 (1) Description≠) Brief explanation of drawings column 8 Supplement I Contents (1) Clear all '11'M 8 'L', E q
II Row Kara Same M 7 Row K Kake"'Cノ, 1")
4'1 is also a side view. 1-FIG. 1 to FIG. 4 each show a separate σ) embodiment of the present invention, and all of them are longitudinal sectional side views. -1 and (+li 11-).

Claims (2)

[Claims] (1) A foil or sheet mainly composed of aluminum is used as an insert material between the iron-based base metal and the silicon-based ceramic sliding material, and tan, silver or gold is placed on the inner and/or outer periphery of this insert material. A mechanical seal that is equipped with a ring that is made by sandwiching a corrosion-resistant material whose main component is one of the two and diffusion-bonding them into one piece. (2) The mechanical seal according to claim 1, wherein the iron base metal is a stainless steel base metal.